Johannes Schwaiger

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A formerly developed ultrasound liver phantom for testing of surgical navigation systems and liver resection trainings was evaluated experimentally. The phantom was scanned with CT and the dataset was analyzed with existing segmentation techniques. A virtual 3D model was generated on the basis of the segmentation; it was later used for phantom registration(More)
Purpose: Patient-specific models of organs improve the planning of surgical resections and the intraoperative approach. In particular, pancreatic cancer surgery can benefit from a manufactured, patient-specific model. Therewith, the complex anatomical structures of and around the pancreas, especially the vessels, can be visualized. Methods: Several CT data(More)
In clinical routine of liver surgery there are a multitude of risks such as vessel injuries, blood loss, incomplete tumor resection, etc. In order to avoid these risks the surgeons perform a planning of a surgical intervention. A good graphical representation of the liver and its inner structures is of great importance for a good planning. In this work we(More)
Hepatic vessel structure is very important to ensure the blood supply of the liver tissue. Therefore the knowledge of the hepatic vessel system is indispensable in liver surgery planning, for example before performing a liver resection. The purpose of this paper is to present an easy to use and fast method concerning hepatic vessel segmentation and risk(More)
In liver surgery, preoperative planning is usually performed by using CT scans. Ultrasonic probes are frequently used operatively to verify tissue deformations, for example when resecting a liver tumor with an ultrasonic dissector. Avoidance of dissecting vitally important hepatic vessels and the recrudescence of tumors are of crucial importance. The(More)
During the last few years, regional anesthesia using ultrasound imaging has increased dramatically in both clinical and research areas. This method provides a direct noninvasive imaging of the targeted nerve and the tissue around it in real time. Furthermore, it allows anesthetists to observe the injected anesthetics for optimal distribution. However, there(More)
In this paper a new slicing method for filling an arbitrary polygon with 3D-balls for a 3D plastic droplet generation process is presented. The work principle of the 3D plastic droplet generation is to squeeze the plastic material through a nozzle, out of which small hardened balls are formed and based on the contour and infill algorithm the 3D objects(More)
Exercise capacity in patients with dilated cardiomyopathy has low correlation to resting left ventricular function. Dysfunctional autonomic activity, cardiomechanics and inflammation are associated with exercise capacity but were investigated under inhomogeneous situations. It remains essentially unclear which factor mainly determines exercise capacity in(More)